Hi I hope I do not offend you if I ask could you mean a 127 UH which was a large single blade Uncle Henry which if memory serves had an internal brass liner lock. I really do not remember a 172 however they did make a smaller version of the 127 UH I thought it might be one of those but I have disposed of any of that style I had in the past and reference material on what is considered newer stuff is difficult ( The UH line began in the late 60tys under the Schrade Walden tang but mostly was made in the Schrade tang. after 72 or 73), until present. If it is a 127UH there is one for sale on ebay right now #11335354704. If the numbers are not inverted it would seem to be a smaller knife. Sorry I could not have been of more help I have a bunch of numbers around 172 in the older stuff Schrade Walden and Schrade Cut but, in the Schrade history it does not necessarily relate ( except to make it a one blade model). Good luck Rich
[This message has been edited by lt632ret (edited 04-11-2001).]